Just got finished tearing down and replacing collapsed DoD lifter on my 4th gen 5.3L (2008 Silverado). I’ve now got my computer tuned to shut off AFM/DoD and am wondering…. Would just cutting the oil tower gaskets inside the VLOM and the tune be enough to prevent the issue in the future, without a plug? Or is the plug absolutely necessary? Thanks
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Automotive Vehicle Repair & Performance Shop
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With the VLOM off you pressurize it from the block oil ports side with shop air. Don't use full pressure of course but you are checking for leaks. At rest there should be very little to no air going past solenoids. If it sprays like crazy somewhere you will want a VLOM plug in it.